Condensed Consolidated Income Statements (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Revenue:
Product and maintenance	$ 396,867	$ 374,110	$ 1,165,455	$ 1,085,928
Services	36,896	26,386	95,557	71,906
Total revenue	433,763	400,496	1,261,012	1,157,834
Costs and Expenses:
Cost of product and maintenance	41,206	36,954	114,980	116,858
Cost of services	24,005	17,125	62,571	48,733
Marketing and sales	101,950	100,387	298,880	297,321
Research and development	154,627	148,744	475,597	447,882
General and administrative	28,084	25,894	83,193	86,680
Amortization of acquired intangibles	5,687	6,316	18,037	17,105
Restructuring and other charges	303	11,027	4,164	11,397
Total costs and expenses	355,862	346,447	1,057,422	1,025,976
Income from operations	77,901	54,049	203,590	131,858
Interest expense	(4,177)	(7,523)	(24,111)	(22,160)
Other income (expense), net	1,839	(417)	7,967	4,600
Income before provision (benefit) for income taxes	75,563	46,109	187,446	114,298
Provision (benefit) for income taxes	(2,061)	8,574	15,403	20,430
Net income	$ 77,624	$ 37,535	$ 172,043	$ 93,868
Net income per share - basic (in usd per share)	$ 0.27	$ 0.13	$ 0.60	$ 0.33
Net income per share - diluted (in usd per share)	$ 0.25	$ 0.12	$ 0.55	$ 0.31
Weighted average common shares outstanding - basic (in shares)	284,818	284,462	284,880	283,141
Weighted average common shares outstanding - diluted (in shares)	313,186	309,995	312,899	305,595